By Miki Shima, 7.5" x 9", 234 pages, paperback. Sun Si-miao said, "Without understanding the I-Ching, it is not possible to become a supreme doctor". Based on such statements, a literature developed in China called yi yi or medical I-Ching. The importance of the I-Ching is medicine is still reiterated today. Sifu Tsuei Wei has said "If the Nei Jing is the door to the treasure house of Chinese medical classics, then the I-Ching is its key.